Flies and Swing of the pendulum

Flies noun - Theater) the space over the stage (out of view of the audience) used to store scenery (drop curtains.

Swing of the pendulum and flies are semantically related. In some cases you can use "Swing of the pendulum" instead a noun "Flies".

Flies and swing of the pendulum are semantically related. Sometimes you can replace term "Flies" with "Swing of the pendulum", this terms are similar.